Mercedes-Benz 300 SL straight six. The 300 SL borrowed its 3.0 litre overhead cam engine from the regular four-door 300 luxury tourer introduced in 1951. Featuring a diagonal aluminum head that allowed for larger intake and exhaust valves, it was canted to the right at forty-five-degrees to fit under the SL's lower hood line. In place of three, two-barrel carburetors, a Bosch mechanical direct fuel injection was installed, boosting power 25%. Aperture Priority, Pattern Metering, SB-900 at EV -1.3.